Only use target convention for quotation denormalization

[Enkidu93]

Utilize changes from sillsdev/machine.py#234.

[Enkidu93]

Should we remove the source analysis altogether, @ddaspit, or do you see a reason to keep that in (either for diagnostic information or any future features)? I feel bad that we've created data structures to house this information and are now removing half the information a month later 😵.

[Enkidu93]

Waiting on sillsdev/machine#345